title: Single-crystal diffraction from two-dimensional block copolymer arrays.
abstract: The structure of oriented 2D block copolymer single crystals is characterized by grazing-incidence small-angle x-ray diffraction, demonstrating long-range sixfold orientational order. From line shape analysis of the higher-order Bragg diffraction peaks, we determine that translational order decays algebraically with a decay exponent eta=0.2, consistent with the Kosterlitz-Thouless-Halperin-Nelson-Young theory for a 2D crystal with a shear modulus mu=2 x 10(-4) N/m.
authors.affiliation: Department of Chemical Engineering, University of California-Santa Barbara, Santa Barbara, CA 93106, USA.
authors.forename: G E
authors.initials: GE
authors.lastname: Stein
authors.forename: E J
authors.initials: EJ
authors.lastname: Kramer
authors.forename: X
authors.initials: X
authors.lastname: Li
authors.forename: J
authors.initials: J
authors.lastname: Wang