Superimposed

from WordNet (r) 3.0 (2006)

superimposed
    adj 1: placed on or over something else; "an overlying image"
           [syn: {overlying}, {superimposed}]
    2: with one layer on top of another; "superimposed rocks" [syn:
       {layered}, {superimposed}]

from The Collaborative International Dictionary of English v.0.48

Superimpose \Su`per*im*pose"\, v. t. [imp. & p. p.
   {Superimposed}; p. pr. & vb. n. {Superimposing}.]
   To lay or impose on something else; as, a stratum of earth
   superimposed on another stratum. -- {Su`per*im`po*si"tion},
   n.
   [1913 Webster]