This paper studies the influence of intervally impurity scattering on the condu-ctivities of the disordered layer system. The corrections of the conductivities for the effective dimensionality in the system which depend on the interlayer coupling t are obtained. It is found that the corrections of the conductivities including the intervalley impurity scattering is half as large as those which only involving the intravalley scattering. The crossover effect of dimensionality from 2-D to 3-D in the system have been studied. It is shown that the crossover behaviour depend onthe relaxation time due to the intervalley scattering τ′. For t0)/(τ′))1/2, the sys-tern behave as a two dimensional one, for t> 1/τ((τ0)/(τ′))1/2 the system behave as thoughit were a 3-D one.
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