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A new phase of a known discotic liquid crystal is observed at the interface with a rigid substrate. The structure of the substrate‐induced phase has been characterized by atomic force microscopy, specular X‐ray diffraction, and small‐angle and wide‐angle grazing incidence X‐ray diffraction. The substrate‐induced phase, which has a thickness of ∼30 nm and a tetragonal symmetry, differs notably from...
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