Heat oven to 350°F.
Mix 1/4 cup salsa, sour cream and chicken in small bowl.
Place 2 soft tortillas on ungreased cookie sheet; spread each with salsa-chicken mixture. Spread 2 more soft tortillas with guacamole and stack on top of salsa-chicken tacos, guacamole side up.
Mix refried beans with remaining 1/4 cup salsa; spread mixture onto 2 more soft tortillas and stack on top of guacamole. Top each stack with remaining 2 soft tortillas; sprinkle with cheese.
Bake 8 to 10 minutes until cheese is melted and filling is hot.
Sprinkle with cilantro. Cut each stack into 8 wedges.