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Figured it out!
The rotors on the car were the factory originals and had reached or passed under the minimum allowed thickness. When the new rotors were installed, contact occurred between the caliper pin and the rotor BECAUSE OF A WORN REAR WHEEL BEARING! There was no contact with the thin rotor, so I had no idea. The car has only been driven about 4,000 miles in the past 3 years, mostly by my son, so I was the only one to drive it after the new rotors and pads, and only for 35 miles.
When carefully cleaning and checking the rotor and caliper I noticed a small amount of radial play from the rotor when grasped. When I tested the tire and wheel after mounting, the movement was much amplified, and I realized what had happened.
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