Spread 2 tablespoons of the enchilada sauce in bottom of baking dish. Place 4 tortillas over sauce, overlapping as necessary. Spoon half of the chicken mixture over tortillas; sprinkle with 1/2 cup of the cheese. Spoon half of the remaining enchilada sauce and half of the sour cream randomly over cheese. Repeat with remaining tortillas, chicken mixture, 1/2 cup cheese, the enchilada sauce and sour cream.