Monolayers of asphaltene and resins on the water surface have been transferred at a surface pressure of 10 mN/m onto mica substrates using the Langmuir-Blodgett technique. Atomic force microscopy (AFM) has been used to examine the topography of these layers. Monolayers consisting of pure asphaltene fraction provide a rigid film with a close packed structure, while the resins build up a continuous open network. Mixed films of these two fractions, show that a gradually increase of resin concentration leads to an opening of the rigid asphaltene structure towards a more resin like configuration. Increased aggregation when the two heavy fractions are present in one film, is seen as larger individual units in the AFM-pictures. Addition of high molecular weight demulsifiers/inhibitors resulted in the same kind of influence on the asphaltene film as seen with the resins.