  We report photoemission studies of polycrystalline samples of Sr-doped
GdTiO_{3+delta}, which undergoes a Mott-Hubbard-like metal-insulator transition
at a Ti-concentration of about 20%. The Ti 3d-derived valence band near the
Fermi level displays a two-peak structure consistent with a Hubbard-model-type
interpretation as quasiparticle and lower Hubbard band. Contrary to the
theoretical expectation the lower Hubbard band does not change its energy with
doping. However, the analysis of the core level spectra and elemental mapping
with a scanning electron microscope indicate a strongly inhomogeneous doping
concentration in the probed surface regions. This questions the intrinsic
character of the valence band spectra and demonstrates a general difficulty
when using polycrystalline samples for such studies.
