Rewrite eq.(16)
(31) | |||
(32) | |||
(33) |
Then the relation between the next nearest neighbor is
(34) | |||
(35) |
(36) | |||
(37) | |||
(38) |
generally
at eq.(39), set
use eq.(42) iteratively
(43) | |||
(44) | |||
(45) | |||
(46) | |||
(47) | |||
(48) | |||
(49) | |||
(50) |
If for , 2
(51) |
from eq.(15) using
(52) | |||
(53) |