Layer workout doesn't refer to using specific methods like clusters and HDL. Layering refer to using several different methods for the same lift.
You have strength, power and density methods/loading schemes. 2-4 different layers are used in a workout.
Normally you always start with a strength layer (specifically ramping to a 1, 2 or 3RM). That turns on the nervous system. Then you add the layers best suited to your goal or to the exercise.
For front squats I really like to use a density layer... here are a few options:
a) use 80% of your max and get a total of 30 reps in as little time as possible
b) use 80% of your max and get as many total reps as possible in 8 minutes
c) use 90% and get 10 singles as fast as possible; drop down to 80% and get 10 total reps as fast as possible; drop down to 70% and get 10 total reps as fast as possible
So you would start with a max ramp, then do the density portion.
Of you could do something like this:
1) Paused front squat ramp ( ramp to a paused 1RM... pause for 2-3 sec. at the bottom)
2) Front squat ramp (continue ramping to your max done without a pause)
3) Density work (one of the examples above)
Try this for high pulls from the hang (or blocks)
90% for 3 minutes, 80% for 3 minutes, 85% for 3 minutes, 80% for 3 minutes
The goal is to get as many total reps as possible in the 12 minutes. You can rest as much and as often as you want, but each workout you have to beat your rep total.
"Layering" refers to ramping up than doing something else with the same movement to take advantage of the state of neural activation. It doesn't have to be the clusters and HDL.
For example one could do density work after the ramp.
Here are some possibilities:
1) Use 80% of your max (in the ramp) and perform a total of 30 reps as quickly as possible (doesn't have to be sets of a specific number of reps, just get done with the 30 as fast as you can)
2) Use 80% of your max and perform as many reps as you can in 6 minutes
3) Use 80% of your max and perform as many reps ad you can in 4 minutes; then use 70% and get as many reps as you can in 4 minutes
4) Use 90% and get 10 reps as fast as you can; then use 80% and get 20 reps as fast as you can.
Density work for SGHP:
Here are 3 options:
a) use 80%, perform as many total reps as you can in 5 minutes
b) use 80% get 40 total reps in as little time as possible
c) 90% get 10 total reps in as little time as possible; 80% get 20 total reps in as little time as possible; 70% get 30 total reps in as little time as possible
These are in order of difficulty