Figure 5.

(a) SEM images of two-layer graphoepitaxy structure of a cylindrical BCP thin film revealed by etching. Order is controlled in both layers independently by the positioning of photoresist pillars (visible as bright dots) previously patterned by e-beam DW. Reproduced with permission.⁷⁴ Copyright 2012, American Association for the Advancement of Science (AAAS). (b) Transmission electron microscope (TEM) image of a section of a thick film (>1 mm) of lamellar BCP perpendicular to an applied in-plane external magnetic field is shown with small-angle X-ray scattering data (left). Hexagonally-packed cylindrical BCP aligned along the magnetic field directed normal to the film with fast Fourier transform (FFT) data (inset right). Reproduced with permission.⁸⁵ Copyright 2011, American Chemical Society.