[SI-LIST] Heat issue in PCB's

Hi ,
I have a four layered PCB ,Sig,Gnd,Pwr  & Sig.The gnd & power are 1 Oz copper.
Does the heat dissipation of the PCB's improve , if the thickness of the Power 
planes
is increased to 2 oz Cu.Vice versa , does the heat dissipation go bad upon 
decreasing
the thickness of the Power  planes to 1/2 Oz.

I have two PCB's from two fab houses (Basically same Gerbers).The heat 
dissipation from on one of these is bad as the board from the other fab house
seems lot better in this regard.

I'am interested to investigate into this.Pls suggest me the things
to look for here.

Thanks in advance!!

Best regards
Sunil



      
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