Despite the wishes of the various PCB manufactures, there are other
reasons.
Signal layers should be on the outside, because the signal propagation
speed (I am not sure, wether this is the correct term for
Ausbreitungsgeschwindigkeit) on the outer layers is higher. Tis
probably does not matter on low speed designs but is yet another rule
of thumb on layer ordering.
73, Mario
--
Mario Klebsch mario@klebsch.de
PGP-Key available at http://www.klebsch.de/public.key
Fingerprint DSS: EE7C DBCC D9C8 5DC1 D4DB 1483 30CE 9FB2 A047 9CE0
Diffie-Hellman: D447 4ED6 8A10 2C65 C5E5 8B98 9464 53FF 9382 F518