Abstract
Abstract A small impurity which disturbs only the molecular arrangement in one chiral smectic C layer is modelled by a Somigliana twist disclination loop or by a system of infinitesimal twist disclination loops. A binding energy of a 2π-twist disclination pinned to a small impurity is estimated using the interaction energy between a straight 2π-twist disclination and an infinitesimal twist disclination loop.
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