  We have calculated the electronic band structure of the (100) surface of the
III--V zinc blende semiconductor compounds, using the standard tight binding
method and the surface Green's function matching method. We have found that the
creation of the surface gives place to new states in the electronic structure:
surface resonances and two dimensional bulk states. The two dimensional bulk
states are of the same character of those reported recently in CdTe(100) [Phys.
Rev. {\bf 50}, 1980 (1994)]. We analyze the states in the valence band region
and compare with photoemission spectroscopy data.
