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The eikonal approximation, which is an extremely useful method of calculating intensities for the scattering of atomic beams from surfaces, is extended to include a periodic corrugation of the leading edge of an attractive square-well potential placed in front of the hard repulsive wall. This provides a method for estimating small effects of corrugation of the attractive physisorption potential on the diffraction spectra. Calculations indicate that the relative phase of the attractive welldoi:10.1103/physrevb.62.13142 fatcat:kme54fxxsbbxhka4qww3i2kemy