i am working with a four layer board
and the gap between the inner layer should be 2mm gap
how much did i have to give the thickness of dielectric
Is there any standard values to be assign
If you are talking about controlled impedance board,then you need to tell the pcb fabricators regarding the Board Impedance(like 75 100ohms etc).Rest fabricator will take care.Hope this will help you.And you can ask any fabricators for information.Hitech in bangalore may provide details your looking for...
normally the impedence requirement will define the spacing of the layers.
if impedence is not an issue then u can select ur own option.
i have attached one option here, also it depend on the fabricator too.