Need advice :: layer stack with symmetric voltage supply

[isco]

Hello,
I’m an interested reader for a long time, but this is my first entry. Sorry for my rusty English, but I will do my best.
I have the following question:
I have to design a pcb with 6 layers. The outer layers are reserved for signal routing. The inner layers are for the symmetrical power supply of the board. That mean’s 2 inner layers for GND and the last 2 layers are for ±15V.

Layer-stack:
Signal
GND
+15V
-15V
GND
Signal

Remark: From the viewpoint of the signal-layers, there is no need for impedance controlled layer-stack.

What will be the best layer stack for this task. After which criterions do you select?

Thanks,
isco

 

[isco]

Are there any proposals?
Perhaps yesterday I did not make myself totally clear.
What i want to know: What kind/width of Prepregs are recommended between the layers? After which criterions should i select?
Layer-stack:
Signal
?
GND
?
+15V
?
-15V
?
GND
?
Signal

thanks again...

 

[sivamani]

Stack is ok.Regarding thickness you can check with ur fabricator what is available with him.
Copper thickness is based on your current rating of the planes...