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z z ) z ( R
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r exp(
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W A
a
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+
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r
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do
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r
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r 1 ( cos
1 cos
n
n
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2 2 0
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≈
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=
α
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=
α +
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α
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z
(
r
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r
r
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α
= π
α + π
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2 0 0
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2 0
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0
2 2 0
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0
0 2
2 2
2
A 2
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r 1 n )
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r
(
n
W W ; W
r 2 1 W
r 2
exp
β
γ
=αγ
≈γ
β
−γ
βα+γ
=
−β
+γ