*Marietta Scientific, Inc.*

The reflection coefficient G for a thin sheet of ohms/sq. at normal incidences is

where

and the characteristic impedance of free space is

The characteristic impedance for a thin sheet is r in parallel with free space

and r = resistance (ohms/sq.)

Thus the reflection coefficient is: with

The loss coefficient A is the ratio of the power absorbed in the ohms /sq. to the incident power

where and

The physical optics current J for ohms/sq. at normal incidence is

where incident magnetic field and sheet current (amps/m)

The power absorbed by the ohms/sq. is

Thus the loss coefficient is

or

The transmission coefficient T is the ratio of the power transmitted to the power incident

where

The transmitted and scattering fields are

and

thus

or

Energy is conserved when

Substituting from the above equations