'When the modifier represents new information to the hearers, it is more likely to occur postnominally' (M&M 1999:92). The order seems also to depend on the type of noun (a mass noun, etc. ), see Morse & Maxwell (1999:128).
Source:
Morse & Maxwell 1999:91
Legal Values and Meanings:
Value
Meaning
?
Not known
A
adj-N
B
N-adj
C
both orders with neither order dominant
D
both but for specific forms
E
both but depend on the characteristics of the nominal head