How can I add the new “Floating Action Button” between two widgets/layouts

I guess you have seen the new Android design guidelines, with the new “Floating Action Button” a.k.a “FAB”

For instance this pink button:

enter image description here

My question sounds stupid, and I have already tried a lot of things, but what is the best way to put this button at the intersection of two layouts?

In the above exemple, this button is perfectly placed between what we can imagine to be an ImageView and a relativeLayout.

I have already tried a lot of tweaks, but I am convinced there is a proper way to do it.

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