I do not think there is a specific name for a cross of Black Copper Marans rooster with Silver Laced Wyandotte hen.Off topic just slightly... @NatJ
Black Copper Marans Roo x SLW hen produces? I haven't thought of that cross until you just mentioned it. Is there a name for them or just BYM?
The chicks should be sexlinks (gold daughters, silver sons), but they will also have a lot of black. There might be so much black that sexing by color is not actually practical (maybe not enough gold or silver visible.)
For mature coloring, probably not actually laced, but something sort-of like that, with more black. Daughters should still show gold, and sons show silver, although the sons will probably have red leakage in their shoulders when they grow up, and the "silver" on them will probably be yellowish rather than the nice clean white their mothers have.
Chicks should have rose combs, or a chance of single combs (because some Wyandottes have the not-rose comb gene). Soles of feet should be white (white from the Marans being dominant over yellow from the Wyandotte.)
Daughters will probably lay eggs darker than the Wyandotte mothers, but not as dark as full Marans.