Offset Controller

Create an adjustment layer and apply Slider Expression Controls named "Offset Controller"

Apply code to layer that needed offsetting. Duplicate layer on how much thickness you need.

[Start]
X = (index-1)*thisComp.layer("Offset Controller").effect("Offset")("Slider");
Y = (index-1)*thisComp.layer("Offset Controller").effect("Offset")("Slider");

Z = (index-1)*thisComp.layer("Offset Controller").effect("Offset")("Slider");

value + [X,Y,Z]

[End]