The largest super-cell effects are observed for the UTL framework, for which the super-cell is four times larger than the primitive cell and which contains four D4R units (Table SI S4), allowing us to probe the heterogeneity of D4R unit occupation in UTL as well. The super-cell contains two dense IPC 38 layers connected from each side by a pair of D4R units (Figure ), and similarly to the CTH case (Section 3.2.3), the germanium prefers to form a germanium-rich (pair) of D4R units and the germanium-poorer D4R units, partially phase-separating approximately perpendicular to the [a00] direction (see Figure and also SI Figures ). However, compared to CTH, germanium in UTL still strongly prefers to localize in D4R units, with the larger population of the IPC layers observed only for a very low Si/Ge ratio of 2.8. In the case of BEC, the adoption of a larger simulation cell leads only to intensification and the earlier (at lower Ge content) onset of the trends observed already for the primitive cell, namely, the formation of alternating germanium-rich and germanium-poor 'layers' coplanar with [00c] plane formed from germanium-rich and germanium-poor 'rods' colinear either with [a00] or [0b0] direction (see SI Figure ). Only at Si/Ge = 1, germaniums start to cluster also along the [00c] direction. For IWW and CTH, the changes in the average germanium distribution due to the enlargement of the simulation cell are almost negligible.