added amorphous substrate; type 1 = oxygen, type 2 = Si
added amorphous substrate; type 1 = oxygen, type 2 = Si

tcmoore3/mbuild,ctk3b/mbuild,iModels/mbuild,sallai/mbuild,summeraz/mbuild,Jonestj1/mbuild,sallai/mbuild,ctk3b/mbuild,iModels/mbuild,tcmoore3/mbuild,Jonestj1/mbuild,summeraz/mbuild