The format of subsequent rounds is the same as the first.
The exception is if the number of players in a round is such that the largest group is less than the maximum group size. Due to a bug, in the next round the maximum group size resets to the largest in the previous round.
I'm confused - how do you find out the details of the 2nd rd of a tnmt you're playing in? For instance, in the link below I'm unable to determine how many games I'll be assigned in the 2nd rd - is there any way to tell besides asking the TD (assuming they even know)?
http://www.chess.com/tournament/satom-international-open-slug-tournament