Depth of field with multiple cameras

Hey everyone, I'm trying to render my scene with two cameras, one rendering the background(depth 0) and the other the foreground(depth 1, "don't clear"). But I'm having trouble getting Unity's depth of field post process to work between cameras. I have the depth of field on the foreground camera w$$anonymous$$ch works fine, but everyt$$anonymous$$ng on the background camera is ignored. After looking at it with the frame debugger, i noticed that the foreground camera is recreating the depth texture, thus excluding anyt$$anonymous$$ng draw with the background camera. Is there anyway I could have the foreground camera either "add" to the existing depth texture, or maybe composite them together before the DOF post process fires? Or am I missing an obvious solution? Let me know if I left any important details out. Thanks for the help :)