3.3. X-ray diffraction results
XRD scans (e.g., Fig. 8) for the virgin, bleached, and UV irradiated
hair show two amorphous halos around 2h 9.2 and 20.3,
and a shoulder at about 24 for the second halo, which conforms
to the fact that human hair has a overall crystallinity of about
20% [54]. The shape of these curves and the peak positions do
not alter much between the samples, implying that the fibrillar