I guess you mean the famous D/G ratio, measured by Raman spectroscopy ? Each carbon material has its own value, which also depends on the wavelength of the laser. Additionnally, graphite can be more or less disordered, but totally disordered would mean amorphous, i.e., it would not be graphite anymore. Therefore there is no single anwer to your question. Only the method, getting the spectrum at one given wavelength at least, and comparing with values of the literature, is clear, able to bring some information on the nature of disorder in one, given, graphite sample.
Alain
Usually, you need to fit your Raman spectra with D,G and other peaks after substracted the backgroud (you can fit their position to the value reported).
This paper may helps you:
A. C. Ferrari and J. Robertson Phys. Rev. B 61, 14095
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