  We discuss the experimental photoemission and inverse photoemission of early
transition metal oxides, in the light of the dynamical mean field theory of
correlated electrons which becomes exact in the limit of infinite dimensions.
We argue that a comprehensive description of the experimental data requires
spatial inhomogeneities and present a calculation of the evolution of the
spectral function in an inhomogenous system with various degrees of
inhomogeneity. We also point out that comparaison of experimental results and
large d calculations require that the degree of correlation and disorder is
larger in the surface than in the bulk.
