Laminated walls consist of an outer skin, usually fiberglass, (metal framework I believe), a foam type insulation core, and inner wood paneling all bonded or laminated into one piece. These are the sidewalls that can suffer delamination.
These walls usually do not have wiring in them. Many Fleetwoods and others use laminated walls. At one time they were easily identified as they have no light switches or receptacles in the outer walls. The light switches and receptacles are on the bottom of the upper cabinets.
Newmar does not use laminated walls. They use aluminum studs with fiberglass insulation between them. The inner paneling is "glued" to the studs. Also the outer sidewall is "glued" to the studs.
For years Newmar and many RV manufacturers used and still use sidewalls supplied by Crane Composites/Noble
These sidewalls were originally a fiberglass outer skin bonded to a luan substrate. The luan substrate was a frequent cause of sidewall defects, but delamination was not usually associated with these sidewalls.
As member Iron Man notes above, Crane/Noble started supplying the C-Tek sidewall which was all man made with no luan substrate, which Newmar starting using in the high end coaches. This sidewall proved to be superior to the luan substrate sidewall.