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Spin-resolved photoemission from polycrystalline Cr02 films shows a spin polarization (P) of nearly +100% for binding energies near 2 eV belo~the Fermi level (El. -). Despite the metallic resistivity behavior, extremely low intensity is observed in the photoemission spectra near EF. Our findings are in contrast to recent band-structure calculations, predicting Cr02 to be a half-metallic ferromagnet with I' =+100% at Ep. PACS numbers: 75.50.Cc, 71.25.Pi, 79.60.Cn The ferromagnet Cr02 is one of the technologically most important transition-metal oxides. But surprisingly enough, its electronic structure is up to now an open question.A first qualitative model was proposed by

Spin-polarized photoemission spectra at low photon energies from ferromagnetic ultrathin Fe layers on Cu(l00) show a substantial polarization of the Cu 3d peaks. This is attributed to spin-dependent attenuation in the Fe overlayer. Values of the spin-dependent mean free path at low electron energies are obtained.