Depends on the "ameraucana". If it's a pure bred bird that lays blue eggs, then blue + brown = green.
If it's actually an Easter egger laying green eggs, you're going to get some muddy shade of green or shades of brown, depending on the bird's individual genetics.
I'm not sure what your abbreviation of rr is...sorry...(did you mean Rhode Island Red? or Rhodebar?)
To get an olive egger you need a very dark egg laying bird on one side like a Welsummer or Marans or Penedesenca and then a blue egg layer on the other side such as an Ameraucana or Araucana or Cream Legbar or an Easter Egger that carries the blue gene.
If you have the Easter Egger with the blue gene, you will likely only get 50% olive eggers/some shade of green and 50% of brown eggers (as it was explained to me) as the EE is a mixed bird that may only have one blue gene so you'll get some with the blue/brown to produce green and some with brown/brown to produce shades of brown.