Symmetrical concentric-ring barrel structure

Figure 30 shows the symmetrical concentric-ring barrel structure (A-B-A)m confined between two ring-like curved surfaces (cylinders). It is assumed that the fringe thickness is the same for both the exterior and interior layers, while that of the middle layers is nearly twice in size regardless of A domain or B domain. This assumption has been proved to be valid via MC simulation mentioned above. 

Figure 30 Symmetrical concentric-ring barrel structure (left) confined in the ringlike surface and a unit cell with one lamellar period L (right).

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