The ultimate goal of the present investigation was the classification of organic surface films by determining their viscoelastic parameters with the help of multi-frequency radar techniques. This aim has been approached by the following strategy: laboratory measurements which included chemical and physicochemical characterization of the system slick/vicinal water layer. As a consequence of this endeavour, about 24 different slick-forming materials were selected. Wind-wave-tank experiments were performed using these 24 substances, nine of which were chosen for further investigations on the open sea. During the SAXON-FPN experiments these nine slick-forming substances and, in addition, a mixture of compounds, were disseminated on the sea surface and overflown by the airplanes and the HELISCAT which were available during the respective campaignsSIGLEAvailable from TIB Hannover: D.Dt.F. QN1(5,19) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman