Abstract
The very strong absorption of low energy electrons by matter has some consequences on the symmetry of diffraction patterns. The symmetry of a pattern is that of one or several structural planes according to the depth reached by the electrons. It may differ from the symmetry of the crystal unit cell. When the symmetry of the crystal is lower than that of the structural planes, the symmetry of the pattern corresponds to that of the diffracting medium whereas if the symmetry of the crystal is higher than that of the structural planes, the symmetry of the pattern is lower than that of the diffracting medium.
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