Abstract
Ultrathin films of a lead-indium alloy are deposited on substrates of the same material at 110 K. The appearance of two maxima in a period of RHEED intensity oscillations for very low values of the glancing angle (≈ 0.35° for incident electrons of the energy of 20 keV) is found experimentally. RHEED intensity oscillations are calculated to show that the results can be explained within the RHEED dynamical theory. The effect has important experimental consequences which are discussed.
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