The difference between Arata's work and what I proposed and the reference in this thread appears to be the formation of the deuterated layer on the metal by codeposition by electrolysis and then placement of the formed layered metal in a deuterium gas atmosphere and heating it.
Sounds like a Patterson cell?
Construction
https://en.wikipedia.org/wiki/Patterson_power_cell
The cell has a non-conductive housing. The cathode is composed of thousands of sub-millimeter microspheres (co-polymer beads), with a flash coat of copper and multiple layers of electrolytically deposited thin film (650 Angstrom) nickel and palladium. The beads are submerged in water with a lithium sulfate[2] (Li2SO4) electrolyte solution.