Equation (6.35) is the FHH isotherm that describes the continuous growth of film thickness with increasing relative pressure. For a flat surface, the film thickness is related to the adsorbed amount N through z = Na/Nm. Consequently, for a flat surface, the multilayer film growth is governed by

Since Equation (6.35) also provides a characteristic distance scale for a fractal surface, it is possible to construct the surface at the distance z from the fractal

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