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A study has been made of hillock-like features which sometimes occur on {1, 0, 0} surfaces of epitaxial gallium arsenide. X-ray diffraction topography reveals that the hillocks contain cores of twin which originate at, or near, the epitaxial interface. During growth of the layer the twins can become buried, leaving a surface which is matrix-oriented.
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Holloway et al. (1967) studied this question.
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