The adsorption behavior and surface excess of an asymmetric poly(styrene)-block-poly(ethylene oxide) copolymer, 4.2% by mass poly(ethylene oxide), from a cyclohexane solution onto a SiO2 surface are studied as a function of polymer concentration. Adsorption experiments were conducted at a temperature below the Theta temperature for polystyrene in cyclohexane (T-Theta = 35degreesC). Strong evidence is observed supporting the formation of micelles above a polymer concentration of 0.030 mg/mL at similar to20degreesC. This evidence for micelle formation is manifested as a marked jump in the observed surface density (determined by ATR-FTIR spectroscopy) and a corresponding change in the rms radius of gyration of the polymer (determined by multiangle light scattering measurements) at high polymer concentrations. The physical association of copolymer onto the surface above and below the critical micelle concentration is explored through rinsing experiments with a good solvent (CCl4) for polystyrene. The results of these experiments suggest limited (monolayer) micelle adsorption and imply that these micelles attach to the surface by association with adsorbed monomolecular copolymer.