1. A two-dimensional data matrix structure, comprising:a first substrate;
a first metal layer disposed on the first substrate, wherein the first metal layer has a plurality of sections and a plurality of empty regions that are formed according to a two-dimensional data matrix pattern, and each of the empty regions is between two of the sections;
a second substrate disposed on the first metal layer; and
a second metal layer disposed on the second substrate, wherein the first substrate, the second substrate, and the second metal layer commonly have a plurality of through holes, positions of the through holes correspond to positions of the empty regions, the second substrate and the second metal layer commonly have a plurality of blind holes, positions of the blind holes correspond to positions of the sections, the sections of the first metal layer are exposed through the blind holes, and a configuration of the through holes and the blind holes is the two-dimensional data matrix pattern when viewed from above.