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This may be helpful information for those considering Calphalon's Tri Ply Copper series. I received a note that the stainless steel interior layer is 0.4 mm thick, the copper exterior is 0.5 mm, and the aluminum core is 1.6m. I appreciate that the company made this information known.

[Moderator note: The original Q&A - Understanding Stovetop Cookware topic became too large for our servers to handle efficiently, so we've divided it up; the preceding part of this discussion is here: Q&A - Understanding Stovetop Cookware] The initial post is an excellent resource, and I've steered several friends toward it. Scanning through the 20 pages of questions and responses, I did not find information regarding whether one could purchase relatively inexpensive cookware, and then use a thick copper plate between the heat source and the cookware. I have seen such copper plates/sheets at a building supply stores priced quite a bit less than that of copper cookware. Would this idea work? In my mind I see the copper plate solution as little different than the disc construction that many pieces of cookware use, and I take for granted that one could not replicate the clad construction using a thick copper plate with inexpensive cookware. Still the idea seems worth pursuing to me given the price. Please let me know your thoughts.