Thickness measurements of ultra-thin polymeric films using atomic force microscopy - Raposo, Maria; Lobo, Rui Filipe Marmont; Silva, Marcelo de Assumpção Pereira da; Faria, Roberto Mendonça; Oliveira Junior, Osvaldo Novais de (Symposium of the Electrical, Optical and Magnetic Properties of Organic Solidate Materials, 1999)