Some sheets can be constituted-of-or-filled-with (aluminum foil).
A square can be constituted-of-or-filled-with (aluminum foil).
A double layer can be constituted-of-or-filled-with (aluminum foil).
A layer can be constituted-of-or-filled-with (aluminum oxide).
Strips can be constituted-of-or-filled-with (aluminum foil).