Actors overlapping, how to not detect touch on bottom actor?

stanny

Both actors have a when touch rule but I only want to detect the actor on top. But when I touch, both rules fire for both actors. How do I only make the top layer actor fire it's touch rule?

jeezzcake

Is this it?
https://drive.google.com/file/d/0B1vwAScC9gKKZDJjejhfR3M0MlE/view?usp=sharing