Coincidence site lattice theory of multicrystalline ensembles

It is shown how the coincidence site lattice theory, developed originally f or grain boundaries and extended recently to triple junctions, can be appli ed to more complex ensembles of crystallites with the cubic crystal structu re. These include quadruple points, multiple junctions of grains and other multicrystal assemblies. Application of the theory is demonstrated on hypot hetical examples, which may help elucidate some practically important probl ems.