superjacent

from WordNet (r) 3.0 (2006)

superjacent
    adj 1: lying immediately above or on something else [ant:
           {subjacent}]

from The Collaborative International Dictionary of English v.0.48

Superjacent \Su`per*ja"cent\, a. [L. superjacens, p. pr. of
   superjacere; super above + jacere to lie.]
   Situated immediately above; as, superjacent rocks.
   [1913 Webster]