  Stoichiometric, epitaxial LaCrO3 films have been grown on TiO2-terminated
SrTiO3(001) substrates by molecular beam epitaxy using O2 as the oxidant. Film
growth occurred in a layer-by-layer fashion, giving rise to structurally
excellent films and surfaces which preserve the step-terrace structure of the
substrate. The critical thickness is in excess of 500 {\AA}. Near-surface
Cr(III) is highly susceptible to further oxidation to Cr(V), leading to the
formation of a disordered phase upon exposure to atomic oxygen. Recovery of the
original epitaxial LaCrO3 phase is readily achieved by vacuum annealing.
