Rendering inner corners

Am rendering a cement plinth at the foot of a brick exterior wall, it is largely around a protruding window bay and side bay, with 4 external corners and 4 internal ones. I'll put a st steel corner bead on the external corners but what do you put on the internal ones to get an edge for a level finish? - a stop bead used vertically? I should know this, so thanks for any steer!