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Figure 3 Hydrogen bonding system in the bilayer of MePO(OH)2 resulting from molecule 2; with exception of the hydrogen atoms, which are shown as spheres with a common isotropic radius, all other atoms are represented as thermal displacement ellipsoids at the 50% probability level; methyl groups are omitted for clarity; hydrogen bonds are indicated by broken sticks (red); small black balls = center of symmetry; symmetry transformations used to generate equivalent atoms: 1) −x, 2 − y, 1 − z; 2) −x, + y, − z; 3) −x, − + y, − z. |