do ii=1,nslip
   !
     k_alpha(ii)=n_k_alpha(ii)-XX(ii)
     phi(ii)=(sum( Mbar*s_x_m(1:9,ii) ) )-&
          ( -para(8)*k_alpha(ii)+kappa_nl(ii) )-para(11)
     if ( phi(ii).gt.0.d0 ) then
        mclaur=phi(ii)
     else
        mclaur=0.d0
     endif
     !Computation of R_\Delta_\lambda_\alpha
     R(ii)= para(12)*XX(ii)-dt*( mclaur )**para(3)     ! Eq.(40) Diss Mikkel
  enddo

.
.
.

    do ii=1,nslip
       do jj=1,nslip
          if (phi(ii).gt.0.d0) then
             if (ii.eq.jj) then
               Jakob(ii,jj)=Jakob(ii,jj)-para(8)
               Jakob(ii,jj)=para(12)-dt*para(3)*( mclaur )**(para(3)-1.d0)*Jakob(ii,jj)
             else
               !Jakob(ii,jj)=Jakob(ii,jj)*( XX(ii)/(1.d0-damage)*2.d0/lambda_0**2*(XX(jj)-n_k_alpha(jj)) )
              Jakob(ii,jj)=-dt*para(3)*( mclaur )**(para(3)-1.d0)*Jakob(ii,jj)
             endif
          else
             Jakob(ii,jj)=0.d0
             if (ii.eq.jj) then
              Jakob(ii,jj)=para(12)
             endif
          endif
       enddo
    enddo