  It is shown that the peak structure observed in angle-resolved photoelectron
spectra of metallic deposits can only be unambiguously associated to single
electronic states if the deposit has a two dimensional character (finite along
one spatial direction). In one and zero dimensions the density of states shows
peaks related to bunches of single electron states (the finer structure
associated to the latter may not always be experimentally resolved). The
characteristics of the peak structure strongly depend on the band dispersion in
the energy region where they appear. Results for the density of states and
photoemission yield for Ag crystallites on GaAs(110) are presented and compared
with experimental photoelectron spectra.
