We report the results of an experimental study of adsorption as a function of concentration and molecular weight for the system polystyrene/carbon tetrachloride/germanium. Adsorption measurements were made using Fourier transform infrared attenuated total reflection spectroscopy (FTIR-ATR). We find a strong dependence of adsorption on the bulk solution concentration and the molecular weight of the adsorbing polymer. The data provide evidence that the rate limiting step for the adsorption process is the entry of new macromolecular chains into the immediately formed and highly constrained polymer layer. A theoretical model based on the scaling concepts, first introduced by de Gennes, is proposed, and its predictions are compared with the experimental data. The data also suggest the presence of a highly constrained (glassylike) layer, with a structure that depends on the parameters of the system.