Epitaxial dislocations

Abstract
Bullough and Bilby's (1956) theory of a continuous distribution of surface dislocations has been applied to epitaxial interfaces formed with Burgers vectors limited to a discrete set. The types of misfit which can be relieved by one, two and three sets of parallel dislocations are examined. It is shown that the existence of epitaxial dislocations of 60° character in face-centred cubic materials can be rationalized by this approach.