When we compare it with NICS based descriptors at 0, 1 and 2 Å above the plane, we can see that the first two do not correlate with RCS values (See Fig. S2 in SI), this behaviour can be attributed to contributions in the NICS plane and also to contributions from the core electrons of electronegative atoms. It is for this reason that NICS(2) presents a good correlation with the RCS values because the interference at this height is expected to be close to zero. These results confirm that one must be careful in the assignment of (anti)aromaticity using this index. The following sections are intended to perform an exhaustive qualitative analysis of the (anti)aromaticity of these clusters using different strategies proposed in the literature.