Place each chicken breast half between 2 sheets of heavy-duty plastic wrap; pound to 1/4-inch thickness using a meat mallet or rolling pin. Brush chicken with juice, and sprinkle with salt and pepper. Dredge chicken in breadcrumbs. Heat a large nonstick skillet coated with cooking spray over medium-high heat. Add chicken to pan; cook 3 minutes on each side or until chicken is done. Remove from pan; keep warm. Add broth and wine to pan, and cook 30 seconds, stirring constantly. Remove from heat. Stir in capers and butter.