Azimuthal anisotropies in the photoemission from the Te $4d$ and Na $2p$ core levels have been measured for these atoms adsorbed in the $c(2\mathrm{}\times 2)$ configuration on Ni(001). The observed variations with photoelectron kinetic energy, polar angle of emission, and adsorbate species indicate that this is a very promising technique for surface-structure determination. Preliminary multiple-scattering calculations show encouraging agreement with experiments.

• Received 14 July 1978

DOI:https://doi.org/10.1103/PhysRevLett.41.1130