How would you detect the distribution of the constituents of human hair with a diameter of about 80 m using methods of vibrational spectroscopy? Describe

How would you detect the distribution of the constituents of human hair with a
diameter of about 80 µm using methods of vibrational spectroscopy? Describe the
use of at least two different approaches; provide justifications for their use as well
as limitations for each approach. Support your explanation with corresponding
schematics or figures as appropriate.