UTL is a quintessential example of the ADOR-able zeolite (commonly prepared with Si/Ge=4-6) and our calculations confirm a very strong preference for germanium to occupy the D4R units, which is indeed exceptional amongst the zeolite topologies considered herein (see Figure ). Also, we observe, in line with experimental interpretations , a strong preference of germanium to cluster within the particular D4R unit, e.g., in the S4R sub-units (see SI Figure ). Interestingly, the germanium-containing UTL zeolite has been shown to undergo a spectrum of transformations with significantly varying products, ranging from a complete removal of all the D4R units (IPC-4/PCR) to the removal of S4R sub-units from only a fraction of D4R units (IPC-7 ). This variability of products is commonly associated with the varying conditions of the hydrolysis and of the subsequent rearrangement, however, the heterogeneity of the germanium distribution amongst the D4R units, e.g., such as the presence of germaniumrich and germanium-poor UTL-like layers reported above (Section 3.3), can be expected also to play a role. The existence of the UTLlike layers with varying germanium content may serve as a simple explanation for the observation of the partial hydrolysis products composed from a mixture of different connections between the UTL-like layers such as IPC-6 (*PCS) with layers connected by the S4R units or oxygen bridges and IPC-7 with layers connected by D4R or S4R units.