  Layered systems shows anisotropic transport properties. The interlayer
conductivity show a general temperature dependence for a wide class of
materials. This can be understood if conduction occurs in two different
channels activated at different temperatures. We show that the characteristic
temperature dependence can be explained using a polaron model for the
transport. The results show an intuitive interpretation in terms of coherent
and incoherent quasi-particles within the layers. Further, we extract results
for the magnetoresistance, thermopower, spectral function and optical
conductivity for the model and discuss application to experiments.
