sub·ja·cent 
(sŭb-jāsənt)
(sŭb-jāsənt)adj.
1. Located beneath or below; underlying.
2. Lying at a lower level but not directly beneath.
[Latin subiacēns, subiacent-, present participle of subiacēre, to lie beneath : sub-, sub- + iacēre, to lie; see yē- in the Appendix of Indo-European roots.]
sub·jacen·cy n.