hi, I am a currently a year one physics major and during a lab session today and have a question regarding electron diffraction using graphite. Since the electron beam and the circular ring on the screen exhibit cylindrical symmetry(such that if you rotate the beam and the ring, you still get the same pattern), does it mean that the graphite has cylindrical symmetry as well? From my knowledge, the graphite are composed of different layers, thus should not really exhibit cylindrical symmetry. The explanation given by the lab assistant was that the random arrangement of the graphite actually help to compensate off or mask the lack of symmetry in the graphite. I don't quite agree with his explanation. I wonder if someone could help me with this. Thank you in advance!