Access materials Array for a Plane at runtime (C#)

I noticed that you can set up multiple materials on a Plane in the inspector. I need the material to change based on a global static int variable from another script. Here is what I am referring to:

[8952-screen+shot+2013-03-14+at+2.40.25+pm.png|8952]

My question is, how do I access these materials from the code (in C#) so I change them based on the score? I am struggling with these because a Plane does not have a renderer, nor can I use it as a global variable because it seems to be just a Struct with a Vector3 and a Float from the documentation.

Appreciate any help.

Example here: Unity - Scripting API: Renderer.material