  We comment and discuss the findings and conclusions of a recent theoretical
study of the diffraction of He atoms from a monolayer of Xe atoms adsorbed on
the graphite (0001) surface [Khokonov et al., Surf. Sci. 496(2002)L13]. By
revisiting the problem we demonstrate that all main conclusions of Khokonov et
al. that pertain to the studied system are at variance with the available
experimental and theoretical evidence and the results of multiple scattering
calculations presented in this comment.
