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Explanation: I found this in ENCARTA WORLD ENGLISH DICTIONARY:
su·per·im·pose [sprim pz ] (past su·per·im·posed, past participle su·per·im·posed, present participle su·per·im·pos·ing, 3rd person present singular su·per·im·pos·es) transitive verb
1. lay something over something: to place something, for example, a transparent image, on or over something else, often with the result that both things appear simultaneously, although one may partially obscure the other
2. add onto something: to add a feature or element without incorporating it superimpose one culture on another