PlatformGame HeadAngle

I have been coding a platform game for several months in actionscript and I have started to program a boss for the level I created. The boss is several times larger on the stage than the hero. I was wondering if I there was a way to devise measuring the angle from the boss head created as a seperate movieclip to the hero moveclip. This angle could then be able to rotate the bosshead so that the head remains looking at the hero.