[SI-LIST] PCB stackup

Hi all, 

I am working on a product which requires high shielding (no 
interference with mobile pagers) and the PCB goes in plastic 
enclosure (w/o metallic paint).  The highest working frequency is 
200Mhz and the PCB stackup is : 

TOP    ground
Layer1 signal + power fill 1.8V
Layer2 ground
Layer3 signal + power fill 3.3V
Layer 4 signal + power fill 5V
Layer 5 ground
Layer 6 signal + power fill 3.3V
Bottom ground 


Is this stackup ok? and do you think that not having a full power 
plane would be a problem?


thanks 



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