Figure 1
The circumference [2 \pi l] of a circle with radius l on the undeformed wafer has to contract down to [2 \pi l^{\,\prime}] in order to fit on a spherical surface with bending radius R. The relation of the used cylindrical coordinate system [(r,\varphi,z)] to the Cartesian system (x,y,z) is shown on the right. For convenience, the same label for the z-direction is used in both systems.  [article HTML]

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