Comment on "Structure of the Mn-induced Cu(100) c(2 x 2) surface"

Abstract

We have studied the atomic arrangement of Mn upon deposition on Cu(100) at room temperature using low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). Scanning tunneling microscopy reveals that Mn is already incorporated at very low coverages (\ensuremath{\sim}0.005 ML Mn). Both LEED and STM show that the surface alloy is characterized by a considerable corrugation where Mn atoms are displaced outside by 0.30 \AA{}. Our findings are at variance with a recent STM study [Phys. Rev. B 52, 2735 (1994)] which reports a corrugation of approximately 0.12 \AA{} and claims Mn incorporation only above a critical Mn coverage which should be larger than 0.06 ML. \textcopyright{} 1996 The American Physical Society.