Both the K order as well the buckling of the layers would likely define this material to be new, but at this point it is unclear if either of those are present in the synthetic product described in the A-lab paper. For example, K 0.3 MnO 2 has been reported in the hexagonal space group P 6 3 /mmc, in a structure that belongs to one of the stacking variants of the α-NaFeO 2 -structure. This structure is shown in Fig. ; it has neither ordered K nor buckled layers. K 0.3 MnO 2 is known to result from the thermal decomposition of KMnO 4 above 800°C. As A-lab's reaction conditions included a 1000°C heating step, K 0.3 MnO 2 is a likely product. The PXRD fit for KMn 3 O 6 provided in the A-lab paper 4 is of very poor quality and misses some major reflections as shown in Fig. . Comparing it to the simulated PXRD pattern of K 0.3 MnO 2 (Fig. (e)), reveals that the main measured reflections are well reproduced by those simulated to appear K 0.3 MnO 2 . Still, there is an intensity mismatch, which could be caused by preferred orientating, impurities, or additional phases. There are many layered K-Mn-O materials in the literature that could also explain the PXRD data.