here is part of the model, the only difference between metal resistance models is the sheet resistance.
.LIB TT_RES
.Param
......
r_rm1l = 0.0791 r_rm1s = 0.115 r_rm1w = 0.109
.......
.ENDL TT_RES
*********************************** Metal 1 with W/S=0.108/0.324 ***********************************
.subckt rm1l n1 n2 l=length w=width scale=1 m=1
.param Rsh = r_rm1l
.param dw = 0
.param pvc1 = 0 pvc2 = 0 ptc1 = 2.846E-03 ptc2 = -5.351e-07
.param pt='temper'
.param tfac='1.0+ptc1*(pt-25.0)+ptc2*(pt-25.0)*(pt-25.0)'
r1 n1 n2 'rsh/m*l*scale/(w*scale-dw)*(1+pvc1*(abs(v(n2,n1))/l/scale)+pvc2*(v(n2,n1)/l/scale)*(v(n2,n1)/l/scale))*tfac'
.ends rm1l
*********************************** Metal 1 with W/S=0.108/0.108 ***********************************
.subckt rm1s n1 n2 l=length w=width scale=1 m=1
.param Rsh = r_rm1s
.param dw = 0
.param pvc1 = 0 pvc2 = 0 ptc1 = 2.846E-03 ptc2 = -5.351e-07
.param pt='temper'
.param tfac='1.0+ptc1*(pt-25.0)+ptc2*(pt-25.0)*(pt-25.0)'
r1 n1 n2 'rsh/m*l*scale/(w*scale-dw)*(1+pvc1*(abs(v(n2,n1))/l/scale)+pvc2*(v(n2,n1)/l/scale)*(v(n2,n1)/l/scale))*tfac'
.ends rm1s
*********************************** Metal 1 with W/S=0.324/0.162 ***********************************
.subckt rm1w n1 n2 l=length w=width scale=1 m=1
.param Rsh = r_rm1w
.param dw = 0
.param pvc1 = 0 pvc2 = 0 ptc1 = 2.846E-03 ptc2 = -5.351e-07
.param pt='temper'
.param tfac='1.0+ptc1*(pt-25.0)+ptc2*(pt-25.0)*(pt-25.0)'
r1 n1 n2 'rsh/m*l*scale/(w*scale-dw)*(1+pvc1*(abs(v(n2,n1))/l/scale)+pvc2*(v(n2,n1)/l/scale)*(v(n2,n1)/l/scale))*tfac'
.ends rm1w