The other surfaces with an excess of O atoms (Figure ) also show differences between the DOS for spin-up and spin-down electrons. For the Cu 2 O(110):Cu/O surface, this deviation is also most pronounced at the valence band maximum, while for the Cu 2 O(111):O surface, the most significant deviation is apparent at the conduction band minimum. However, the DOS for the surfaces with an excess of Cu atoms (Figure ), as well as for the Cu 2 O bulk (Figure ), shows a nearly identical shape for spin-up and spin-down states and, accordingly, no spin polarization.