Layerwise spin-polarized DOS for one layer of Fe/Co deposited on Au substrate. Here, S and S − 1 represent interface layers. (a) and (d) x = 0 (sharp interface), (b) and (e) x = 0.05, and (c) and (f) x = 0.10 (rough interface). Solid line: spin-up DOS. Dotted line: spin-down DOS. Fermi level is reset at zero.