Using a decimation technique, and imposing electrostatic self-consistency, we compute the surface electronic structure of various CoSi2(111)/Si(111) phases. The projected band structures and LDOS indicate a richness of surface related features. For the (1 x 1)Co-rich termination excellent agreement with experimental data and a recent DFT investigation is obtained. Strongly localized surface states on the high chain atoms of the (2 x 1) Pandey-chain like reconstruction are identified as causing the experimentally observed surface topography induced contrast in Ballistic Electron Emission Microscopy (BEEM) images of such films. (C) 2000 Published by Elsevier Science B.V.