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A new electron-phonon interaction characteristic of layer structures is described. Depending on the strength of the coupling between electron and lattice, this interaction, which involves short-range forces, leads to free or self-trapped charge carriers. The theoretical findings are compared with the experimentallv determined charge-carrier mobilities in GaSe and MoS 2 .

A quasiclassical transport theory for ferromagnets of large bandwidth is outlined, covering both the ordinary galvanomagnetic effects associated with the Lorentz force and the "spontaneous" effects related specifically to the magnetization. The latter effects are mediated by the spin-orbit interaction and are shown to consist of a scattering-independent Hall effect with no concurrent changes of the longitudinal resistivity, and a Hall effect accompanied by changes of this resistivity and which appears only in the presence of impurity scattering. The manner in which these various effects combine with the usual galvanomagnetic effects is also investigated.

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