Dielectric Constant of Conductor Copper Layer

Hi All,

Setup --> Cross Section

The "Layout Cross Section" window allows "Autosolve Mode" to calculate the trace characteristic impedance given all the parameter values ( thickness, dielectric constant, conductivity etc).

May I know the correct value to put for "Dielectic Constant" of a Conductor Copper layer?

Should this value be infinity? 

Problem is that when I put a very high value, the impedance goes down to almost zero (which isnt true in practice)

Thanks All 

Image may be NSFW.
Clik here to view.