Polarized Photon Structure: $g_1^\gamma$ and $g_2^\gamma$
  We investigate the polarized photon structure functions $g_1^\gamma$ and $g_2^\gamma$ which can be studied in the future polarized version of ep or e$^+$e$^-$ colliders. The NLO QCD calculations of $g_1^\gamma$ and the possible twist-3 effects in $g_2^\gamma$ are discussed. 
Hideshi Baba, Ken Sasaki and Tsuneo Uematsu