  The paper presents a joint consideration of Raman spectra of sp2 amorphous
carbons alongside with the nature and type of their amorphicity. The latter was
attributed to the enforced fragmentation. The fragments, presented with
size-restricted graphene domains with heteroatom necklaces in the
circumference, are the basic structural units (BSUs) of the solids, determining
them as amorphics with molecular structure. The standard G-D-2D pattern of
Raman spectra of polycyclic aromatic hydrocarbons, sp2 amorphous carbons,
graphene and/or graphite crystal is attributed to BSUs graphene domains. The
molecular approximation allows connecting the G-D spectra image of one-phonon
spectra with a considerable dispersion of the C=C bond lengths within graphene
domains, governed by size, heteroatom necklace of BSUs as well as BSUs packing.
The interpretation of 2D two-phonon spectra reveals a particular role of
electrical anharmonicity in the spectra formation and attributes this effect to
a high degree of the electron density delocalization in graphene domains.
