Topology is shown in figure AR1 configuration
Sys
Ipv6
Int g0/0/0
IP address 12.1.1.1 24
Int g0/0/1
Ipv6 enable
Ipv6 address: 2002:1 64
Int tunnel 0/0/1
Ipv6 enable
Ipv6 address: : 12.1.1.1 96
Tunnel protocol ipv6 and ipv4 auto tunnel
The source g0/0/0
Ipv6 route - 2001: the static: 64 tunnel0/0/1
AR2 configuration
Sys
Ipv6
Int g0/0/0
IP address 12.1.1.2 24
Int g0/0/1
Ipv6 enable
Ipv6 address: 2001:64
2Int tunnel 0/0/1
Ipv6 enable
Ipv6 address: : 12.1.1.2 96
Tunnel protocol ipv6 and ipv4 auto tunnel
The source g0/0/0
Ipv6 route - 2002: the static: 64 tunnel0/0/1

Pc1 can't pc2 o is really a great god answer something wrong