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Hot-filament process was recently employed to convert, totally or partially,few-layer graphene (FLG) with Bernal stacking into crystalline sp$^3$-C sheetsat low pressure. Those materials constitute new synthetic carbon nanoforms. Theresult reported earlier relies on Raman spectroscopy and Fourier transforminfrared microscopy. As soon as the number of graphene layers in the startingFLG is higher than 2-3, the sp$^2$-C to sp$^3$-C conversion tends to be partialonly. We hereby report new evidences confirming the sp$^2$-C to sp$^3$-Cconversion from electron diffraction at low energy,Raman spectroscopy andDensity Functional Theory (DFT) calculations. Partial sp$^2$-C to sp$^3$-Cconversion generates couples of twisted, superimposed coherent domains (TCD),supposedly because of stress relaxation, which are evidenced by electrondiffraction and Raman spectroscopy. TCDs come with the occurrence of a twistedbilayer graphene feature located at the interface between the upper diamano\"iddomain and the non-converted graphenic domain underneath, as evidenced by aspecific Raman signature consistent with the literature. DFT calculations showthat the up-to-now poorly understood Raman T peak originates from asp$^2$-C-sp$^3$-C mixt layer located between a highly hydrogenated sp$^3$-Csurface layer and an underneath graphene layer.

Towards a better understanding of the structure of diamano\"ids and diamano\"id/graphene hybrids