  We investigate the effect of short-range order (SRO) on the electronic
structure in alloys from the theoretical point of view using density of states
(DOS) data. In particular, the interaction between the atoms at different
lattice sites is affected by chemical disorder, which in turn is reflected in
the fine structure of the DOS and, hence, in the outcome of spectroscopic
measurements. We aim at quantifying the degree of potential SRO with a proper
parameter. The theoretical modeling is done with the Korringa-Kohn-Rostoker
Green's function method. Therein, the extended multi-sublattice non-local
coherent potential approximation is used to include SRO. As a model system, we
use the binary solid solution Ag$_c$Pd$_{1-c}$ at three representative
concentrations $c=0.25$, $0.5$ and $0.75$. The degree of SRO is varied from
local ordering to local segregation through an intermediate completely
uncorrelated state. We observe some pronounced features, which change over the
whole energy range of the valence bands as a function of SRO in the alloy.
These spectral variations should be traceable in modern photoemission
experiments.
