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. 2016 Sep 12;6:32896. doi: 10.1038/srep32896

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Copyright © 2016, The Author(s)

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Sketches of the structure with respect to the scattering plane (green plane), for (a) the bulk like infinite layer, (b) the Π sheet orientation, (c) the Σ-sheet orientation. Red (blue) balls depict oxygen (copper). Strontium atoms are omitted for clarity.