  Taking advantage of the large electron escape depth of soft x-ray angle
resolved photoemission spectroscopy we report electronic structure measurements
of (111)-oriented [LaNiO3/LaMnO3] superlattices and LaNiO3 epitaxial films. For
thin films we observe a 3D Fermi surface with an electron pocket at the
Brillouin zone center and hole pockets at the zone vertices. Superlattices with
thick nickelate layers present a similar electronic structure. However, as the
thickness of the LaNiO3 is reduced the superlattices become insulating. These
heterostructures do not show a marked redistribution of spectral weight in
momentum space but exhibit a pseudogap of 50 meV.
