In a small bowl combine the sour cream and 3/4 of the cheese.
Pour into a baking dish a small amount of enchilada sauce to coat bottom. Layer 6 tortillas on bottom of baking dish. Layer half of the cheese-sour cream mixture and 1/3 of the olives over the tortillas. Repeat this layer once more then pour the remaining enchilada sauce over the final layer of tortillas. Sprinkle with the remaining cheese.