h) \  - \cr
&- ( h \,  \gamma_4 \gamma_k \,  A_k\,  R^{\dagger} \hat Q R +
\gamma_4 \gamma_k\,  A_k\,  R^{\dagger} \hat Q R \,  h )
\ , &(\WIbp) \cr
W_2 =  &- ( A_4\, \Omega\, R^{\dagger} \hat Q R +
A_4^{\dagger} \,  R^{\dagger} \hat Q R \, \Omega ) +
\gamma_4 \gamma_k\, ( A_k\, \Omega\, R^{\dagger} \hat Q R -
A_k^{\dagger} \,  R^{\dagger} \hat Q R \, \Omega ) \  + \cr
&+ A_4\,  [\Omega, R^{\dagger} \hat Q R] - \gamma_4 \gamma_k \,
A_k\, [\Omega, R^{\dagger} \hat Q R] \  , &(\WIcp) \cr
W_3 =  &+2\, \Omega\,  \omega - i\,  [ h, \Omega ] \  . &(\WId)
}$$

Taking into account that the electromagnetic potential is Hermitian we get for the $W_1$ and $W_2$ the simpler form:

$$\openup 2\jot \eqalignno{
W_1 = &+ i\,  [ h, A_4\,  R^{\dagger} \hat Q R] - i \,
\{ h, \gamma_4 \gamma_k\,  A_k\,  R^{\dagger} \hat Q R \} \  - \cr
&-2 A_4\, R^{\dagger} \hat Q R\,  \omega \ , &(\WIb)  \cr
W_2 =  &- 2\,A_4\, \Omega \, R^{\dagger}\, \hat Q \, R
 \ . &(\WIc) \cr
}$$

where $[\ ,\ ]$ and $\{\ ,\ \}$ denote commutators and anticommutators, respectively. Also, 