The Glauberman correspondence is a fundamental bijection in the character theory of finite groups. In 1994, Hartley and Turull established a degree-divisibility property for characters related by that correspondence, subject to a congruence condition which should hold for the Green functions of finite groups of Lie type, as defined by Deligne and Lusztig. Here, we present a general argument for completing the proof of that congruence condition. Consequently, the degree-divisibility property holds in complete generality.
"Green functions and Glauberman degree-divisibility." Ann. of Math. (2) 192 (1) 229 - 249, July 2020. https://doi.org/10.4007/annals.2020.192.1.4