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Abstract
Surface resonance scattering in RHEED is shown to result from Bloch wave degeneracy, which gives singular Bloch wave excitations and an anomaly in the surface reflected beam amplitudes. The minimum condition for the resonance to occur is that two reciprocal lattice rods are involved, and the involvement of bound states of atomic planes parallel to the surface is not necessary. The concept of Bloch wave degeneracy has been applied to explain resonance scattering occurring either in the selvedge or/and in the substrate. When the diffraction condition has been so chosen that the diffraction processes are dominated by two reciprocal lattice rods, the total electron wave function is shown to be highly localized at the surface. In a general case when many reciprocal lattice rods are involved, the total electron wave function may or may not be localized, depending on the diffraction condition
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