Photoelectron spectroscopy at kinetic energies of ≊570 eV has been performed on a Cu(111) surface with Co coverages of up to 50 monolayers. The angle-integrated data indicate that tall islands develop with Cu atoms in the top layers. The angular distributions of the photoelectrons were measured using a display-type analyzer with an opening angle of 88°. The Co emission patterns always show some threefold symmetry corresponding to the fcc structure of the clean Cu(111) surface. Most of the Co atoms are in the hcp structure and this fraction increases with coverage.

• Received 18 May 1993

DOI:https://doi.org/10.1103/PhysRevB.48.11361