[Kwant] periodic boundary conditions on the lead

Dear Colleagues, There has already been a discussion on this subject back in 2014, (https://www.mail-archive.com/kwant-discuss@kwant-project.org/msg00124.html) but I am not quite sure I understand the proper solution. I made a lead with rectangular unit cell and naive attempt to make periodic boundary conditions gives a error: "Further-than-nearest-neighbor cells are connected by hopping". The only solution I can think of, is to introduce an auxiliary 1-D lattice made of the atoms along the edge and introduce hopping from this 1D chain to the edge atoms of 2D lead. Hope it will work. Are there any better solutions? Thanks, Sergey