From the Canon Professional Network:
The EOS-1D X Mark II has won rave reviews since its launch back in February 2016 and to help users get more from its incredibly advanced focusing system, Canon has produced a handy downloadable AF Setting Guidebook for smartphone and tablets.Download the Canon EOS-1D X Mark II AF Setting Guidebook via the Canon Professional Network.
Update: Whoops! We previously posted the guidebook's availability when CPN made it available back in November. For some odd reason, the Guidebook available via CPN is only 12MB compared to 100MB for the CDLC version (maybe the CDLC version is significantly higher in resolution?).