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Structural models for Cr2S3 (left) and Cr5S6 (right). The stacking of S layers creates octahedral voids which are fully occupied to form a dense CrS layer of CrS6 edge-shared octahedra which alternates with a partially filled layer, Cr1/3S (left) and Cr2/3S (right) for Cr2S3 and Cr5S6, respectively.
