Recent advances in the control of thin films and surfaces have brought an in- triguing question within reach: Is it pos- sible to tailor the electronic properties of solids by controlling them layer by layer or row by row? Customized molecules are commonplace in biochemistry. Can the same idea be brought to bear on solids and electronic materials? Elec- tronic properties of semiconductor devices have been controlled by hetero- structures, quantum wells, and super- lattices.
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