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US origin and North American Codes.German Philosophy
Basically 20 feet of bare copper cable cast in the concrete.Wiki: Ufer Ground;
During World War II, the U.S. Army required a grounding system for bomb storage vaults near Tucson and Flagstaff, Arizona. Conventional grounding systems did not work well in this location since the desert terrain had no water table and very little rainfall. The extremely dry soil conditions would have required hundreds of feet of rods to be driven into the earth to create a low impedance ground to protect the buildings from lightning strikes.
In 1942, Herbert G. Ufer was a consultant working for the U.S. Army. Ufer was given the task of finding a lower cost and more practical alternative to traditional copper rod grounds for these dry locations. Ufer discovered that concrete had better conductivity than most types of soil. Ufer then developed a grounding scheme based on encasing the grounding conductors in concrete. This method proved to be very effective, and was implemented throughout the Arizona test site.
We do not use any copper inside as foundation reinforcement electrode. Normally is used galvanized steel plate since is cheaper as shown in photos. Nowadays in industrial projects is normally also to connect buried main earthing grid to reinforcement foundations. In this way the total impedance will decrease.US origin and North American Codes.
Google "Ufer Ground".
Basically 20 feet of bare copper cable cast in the concrete.
Using the re-bar will be a matter for local codes.
Using the re-bar is not always a good idea.
A heavy fault current may over-heat a small re-bar to the point that the concrete is fractured.