The Lemon Cuckoo is created by introducing the sex-linked barring gene into a Buff Orpington. The Barring Gene is an inhibitor of color pigment and will cause white bars on any solid color plumage.
You need a double barred male over a barred female in order to have 100% barred offspring. The males will be double barred and the females will be single barred.
Lemon Cuckoo is not a standard color. Only Black, Buff, Blue, and White are APA recognized colors for Orpington.