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Adsorption kinetics of amphipathic diblock AB copolymers of polystyrene-block-polybutadiene from selective solvent onto planar silicon wafer and polystyrene surfaces have been studied by ellipsometry. A theoretical analysis of the adsorption kinetics was applied to investigate the adsorbed layer thickness, the total amount adsorbed at each concentration, and the area occupied by each copolymer chain. Some insight into the architecture of the buoy in the solution is presented. In these studies we found a strong dependence of adsorption rate on the chemical nature of the substrates and on the bulk concentration of the adsorbent. Further, the kinetics of adsorption at different concentrations and temperatures suggest that both single polymer molecules and micelles are responsible for adsorption.