PHONON-PHONON INTERACTION AND THERMAL-CONDUCTIVITY IN STRONGLY ANISOTROPIC QUASI-2-DIMENSIONAL SYSTEMS

The phonon-phonon interaction and phonon thermal conductivity in stron gly anisotropic quasi-two-dimensional systems are considered. Much att ention is being given to the low-frequency bending (out-of-plane) phon ons which can give rise to a low-temperature local maximum in the T de pendence of the in-plane thermal conductivity lambda. The effect of th e system anisotropy on lambda is consistently studied. The results lea d to an interesting interpretation of the anomalous behavior of the in -plane thermal conductivity in strongly anisotropic systems.