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The organic (2-IC<jats:sub>2<\/jats:sub>H<jats:sub>4<\/jats:sub>NH<jats:sub>3<\/jats:sub>)<jats:sup>+<\/jats:sup> cations interleave the inorganic layers. There are two types of 2-iodoethylammonium cations, with synclinal and antiperiplanar conformations. The organic cations interact with the inorganic layers through hydrogen bonds and I...I contacts. 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