During a rejected take off, the captain always take over and initiate the rejected take-off.
Therefore the FO will have the communication and make the first contact to ATC as soon as the parking brake is set. The captain is responsible to stop the aircraft, set the parking brake and advise « cabin crew at your station ». Only during ecam actions and if emergency evacuation is required he will talk to ATC. That’s how we are trained.
Last edited by pineteam; 27th March 2018 at 08:11.
Reason: typo