su·per·ja·cent 
(s′pər-jāsənt)
(s′pər-jāsənt)adj.
Resting or lying immediately above or on something else.
[Latin superiacēns, superiacent-, present participle of superiacēre, to lie over : super-, super- + iacēre, to lie down; see yē- in the Appendix of Indo-European roots.]