Creating Render texture from two or more cameras

I have a situation where I need to create a single render texture to show the view from two or more cameras. I’ve created a “Screen” that is just a flat plane, I’ve also created two cameras and possitioned them next to each other. On the screen I want the left camera to show on the left half of the screen while the right camera shows on the right half. Is there a way to combine parts of different cameras into a single texture?

As I understand you want something like this http://www.cctvcamerapros.com/v/images/Geovision/Geovision-Surveillance-iPad-App-Multi-Camera-View.jpg

I guess you will need anyway to use a small post effect on each cameras that combine the result to the same rendertexture, try to use one rendertexture with uv offset, for each camera specific offset, and custom in script clean deph after rendered all cameras