Fig. 3
Band gap (Eg, Eq. (1)), number of aromatic rings per aromatic domain (NR, Eq. (2)), number of carbon atoms per aromatic domain (nC, Eq. (3)) and aromatic domain radius (aR, Eq. (4)), as a function of the fractional atomic hydrogen content XH for a-C:H using the expressions given by Angus & Jansen (1988) and Angus & Hayman (1988).
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