Other studies focus on the effects of the crystallographic planes and crystal parameters with respect to the FOs. For example, Li and co-workers 156 studied the in-depth single dimensionality FOs near Al(100), (110), and (111) surfaces (Fig. ). The results align well with the theoretical predictions for the Kroing-Penney crystal (Fig. ). Tang and co-workers 157 have determined that in Mg(101n) series, the structures with low Miller indices show less stability than their higher-indices counterparts. Interestingly, they have found that FO may be responsible for local relaxation in such low-index surfaces (see Fig. ). We must mention that some DFT studies of FOs suffer from an unfortunate lack of computational detail, with some only briefly mentioning their final results. For example, Stepaniuk et al. stated: In contrast, our ab initio calculations are in perfect agreement with the experimental data, and predict a first minimum of the interaction energy without mentioning the source for such conclusion. In another work, Weismann et al. did not present sufficient calculation details to reproduce the results.