Table: ai_sugiyama_tennis_match
Columns: date
tournament
surface
partner
opponent_in_the_final
score

Question: What type of surface was played on when julie halard-decugis was the partner on October 8, 2000?
SQL: SELECT "surface" FROM ai_sugiyama_tennis_match WHERE "partner" = 'julie halard-decugis' AND "date" = 'october 8, 2000'