Either crew member can call stop (although there are limited items which an FO is allowed to call stop for to aid ambiguity). PF retards the thrust levers to idle and PM selects max reverse. Once the engines are at forward idle and parking brake is set Captain takes control and roles are reversed to CM1 (who is effectively now PF) and CM2 (who runs ECAM, paper checklists) sounds complex but actually no big deal.
Pilot Incap: Hopefully you'll remember to set your own reverse! (Not a problem for us ex easyJets who still have it in the motor memory).