Retrieve rotation value that was applied at authoring time

What i’d like to do, is to use AS to create a bitmap copy of an mc.

The mc exists on the stage at authoring time, and has an arbitrary amount of rotation applied manually.

At runtime I’d like to query the amount of ‘manual’ rotation applied to the mc, and apply the same amount to the generated bitmap (or to a mc containing the bitmap) so that the rotations match visually.

I think i need to use the built in transform and bitmap classes, but im not quite sure how. any pointers would be much appreciated!