A rich variety of thin-film structures arises from the self-assembly of incompatible block co- and terpolymers (see inside cover). These regular supramolecular structures have critical dimensions in the 10-100 nm regime, and some exhibit high complexity and order. The Figure shows a tapping-mode SFM image of an SBS (polystyrene/polybutadiene block copolymer) film on a silicon substrate after annealing in chloroform vapor.