We report studies of the organization in octadecyltrichlorosilane monolayers that have been prepared by the Langmuir-Blodgett technique. The monolayers, which are covalently bound to an acid-treated mica surface, have been examined by scanning force microscopy in both topographic and frictional-force modes. Both the sizes and number of silane domains on the surface can be altered by choice of the density of the film before transfer from the water surface. When the transfer is carried out in the liquid expanded-liquid condensed two-phase region, the size distribution of islands on the mica surface is bimodal. Parts of the film that originate from the liquid expanded phase consist of small islands whose size can be controlled by the rate of transfer.