Both magnetic structure and magnetic anisotropy energy (MAE) are calculated
for fee and fct Ni films on Cu(001) for thicknesses from I to 10 monolayer
s (ML). The transition from in-plane to perpendicular anisotropy can be att
ributed to the volume contribution to the MAE in fct films which is discuss
ed in terms of layer-resolved band energies. For thicknesses below 5 ML the
effect of quantized electronic states is significant.