Figure 2

(a) Projection along b* of the reciprocal space at 100 K and (b) corresponding (h0lm)* section. On the enlarged (h0lm)* are represented the indexings of the Kamhi’s hexagonal sub-lattice (pink), the 2 monoclinic lattices of the 6-layer (blue) and 2-layer (green) models, the rhombohedral lattice (orange) and the average unit-cell of the modulated structure (red). (c) Corresponding projections of the 3D reciprocal space in 3 unit-cells.