Anomalous magnetic moment of high energy electrons and positrons moving in a crystal and in an amorphous medium

The coherent and incoherent contributions to the anomalous magnetic moment of electrons and positrons of high energies, incident at small angles with a crystallographic plane, have been found. It is shown that in the limit of a weak crystal field averaged along the planes, the obtained formulas describe the anomalous magnetic moment of electrons moving in an amorphous medium.