Abstract
Laboratoire MATOP associe´ au CNRS,Faculte´ des Sciences et Techniques de St. Je´roˆme, F-13397 Marseille Cedex 20, France(Received September 22, 1998)Different elemental dislocation mechanisms are considered and we try to highlight their specialbehaviour in relation to the layer geometry. The nucleation of misfit dislocations is the first step,we show here that the mechanism proposed by Matthews et al. can actually be observed in lowmisfit systems. The development of dislocations is then studied and we underline some particularproblems which could influence the dislocation length: the role of the cooling step and of the un-certainty on G
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