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An analysis is given of the structure, a t high Rayleigh numbers, of therm ally driven cavity flows in fluid-saturated porous media. Particular emphasis is placed on the description of the diffusive layers near the horizontal surfaces. Solutions consistent with the core behaviour deter mined in p a rt I of this series are obtained. These solutions, which are new, indicate th a t the horizontal boundary layers have a double structure in which the outer layer has a thickness where R is thedoi:10.1098/rspa.1982.0093 fatcat:df4wvung7bbobdhoxqfggcri2i