Set material variable with colliding object's material

Hi, I'm trying to grab the material of an object that is overlapping with my trigger and set that to a public variable on the receiving object. I can grab the object it's self and set a gameobject variable, but I can figure out how to access the material on the other renderer. Here is my code,

 //Material Detection System
 void OnTriggerEnter(Collider theCollision)
 {
     if (theCollision.gameObject.tag == "MaterialSwatch")
     {
         incomingObject = (theCollision.gameObject);
     }
 }

I've tried a few methods below to grab the material on the incoming object, but I can't get anything to work.

         //GetComponent<Renderer>().material.CopyPropertiesFromMaterial(theCollision.gameObject);
         //incomingMaterial = theCollision.gameObject.renderer.material;
         //incomingMaterial = hit.theCollision.gameObject.renderer.material;