## Wikipedia - Graphite highly oriented pyrolytic graphite (HOPG)

https://doi.org/10.1351/goldbook.H02823
Highly oriented @P04964@ (HOPG) is a @P04964@ with an angular spread of the c-axes of the crystallites of less than 1 degree.
Note:
Commercial HOPG is usually produced by stress annealing at approximately $$3300\ \text{K}$$.
Source:
PAC, 1995, 67, 473. (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 495 [Terms] [Paper]