The first problem to be addressed is the lack of resolution of the individual signals in each 13 of the three spectra, due to the overlapping spinning sideband manifolds of neighboring resonances. To solve this problem, we employed the 2D adiabatic magic-angle turning (aMAT) experiment, which correlates each spinning side-band manifold to its isotropic shift, thus removing the overlap, as seen in Figure -f for 1 H, C and 29 Si, respectively. In all three cases, the aMAT spectra are able to resolve two resonances with distinct isotropic shifts. For Si, the interpretation is relatively straightforward, with the two signals V and VI being due to the two inequivalent Si nuclei (specifically, one due to Si 1 and the other to Si 2 ). By extension, it is reasonable to tentatively interpret each C signal (III and IV) as being from the three methyl groups attached to each of the Si (C 2/3/4 and C 5/6/7 ), and each 1 H signal (I and II) to the corresponding group of protons (H 2/3/4 and H 5/6/7 ).