Abstract
SUMMARY: The different kinds of crystalline interfaces can be classified by means of the O‐lattice method. Two groups of parameters have to be known for the description of an interface. The first group concerns the structures and the relative orientation of the adjoining crystals and the second group deals with the position and orientation of the interface. The O‐lattice method allows one to deal with the two groups of parameters independently. This method gives a description of the interface in terms of dislocations, and hence of the possible relaxation in the boundary. Different kinds of interface will be discussed and illustrated by electron micrographs.