Place chicken and soy sauce in a shallow dish or heavyduty zip-top plastic bag. Cover or seal, and chill for 15 minutes.
Cook broccoli in boiling water for 3 minutes; drain. Plunge into ice water to stop the cooking; remove from water and set aside. Drain chicken, reserving soy sauce; dredge chicken slices in cornstarch.
Brown chicken, in batches, in a large nonstick skillet coated with cooking spray over medium-high heat for 1 minute per side or until done.* Remove chicken from skillet, reserving drippings; keep chicken warm.
Add reserved soy sauce, onion, ginger, orange rind, red pepper, garlic and sesame oil to reserved drippings in skillet. Sauté for 2 to 3 minutes or until onion is tender.
Add broth and marmalade to soy-sauce mixture, stirring until marmalade is melted. Return chicken to skillet. Bring to a boil for 1 minute. Slowly stir in broccoli and orange sections. Serve dish immediately.