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. 2016 May 23;6:26265. doi: 10.1038/srep26265

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Crystal structures of (a) high-pressure I4₁/amd-KCl, (b) fcc-derived I4/mmm-K₃Cl, and bcc-derived K_n+1Cl_n homologs: (c) I4/mmm-K₂Cl, (d) I4/mmm-K₃Cl₂, (e) I4/mmm-K₄Cl₃, (f) I4/mmm-K₅Cl₄. (g) Spatial distribution of electrons (shown by isosurfaces and density contours) at the Fermi level in I4/mmm-K₅Cl₄, showing clear 2D-metallic character.